NZ785439B2 - Centrifugal separator and a method to control of the same - Google Patents
Centrifugal separator and a method to control of the same Download PDFInfo
- Publication number
- NZ785439B2 NZ785439B2 NZ785439A NZ78543920A NZ785439B2 NZ 785439 B2 NZ785439 B2 NZ 785439B2 NZ 785439 A NZ785439 A NZ 785439A NZ 78543920 A NZ78543920 A NZ 78543920A NZ 785439 B2 NZ785439 B2 NZ 785439B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- outlet
- centrifugal separator
- hermetic
- separator according
- flow rate
- Prior art date
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
- B04B1/04—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with inserted separating walls
- B04B1/08—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with inserted separating walls of conical shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B11/00—Feeding, charging, or discharging bowls
- B04B11/02—Continuous feeding or discharging; Control arrangements therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B13/00—Control arrangements specially designed for centrifuges; Program control of centrifuges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B5/00—Other centrifuges
- B04B5/04—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers
- B04B5/0442—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers with means for adding or withdrawing liquid substances during the centrifugation, e.g. continuous centrifugation
- B04B2005/0464—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers with means for adding or withdrawing liquid substances during the centrifugation, e.g. continuous centrifugation with hollow or massive core in centrifuge bowl
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B5/00—Other centrifuges
- B04B5/04—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B5/00—Other centrifuges
- B04B5/04—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers
- B04B5/0442—Radial chamber apparatus for separating predominantly liquid mixtures, e.g. butyrometers with means for adding or withdrawing liquid substances during the centrifugation, e.g. continuous centrifugation
Abstract
centrifugal separator for clarification of a liquid mixture into a heavy phase and a light phase, having a centrifugal separator bowl rotatable around an axis X and encasing a separation space (106), and a sludge space (12) radially outward of said separation space. The centrifugal separator bowl comprises a hermetic inlet (4) for feeding a liquid mixture to said separation space (106); a first hermetic outlet 1 for a separated clarified light phase; a second hermetic outlet (2) for a separated heavy phase; a plurality of outlet conduits (5) extending from an outer position in said sludge space (12) to said second hermetic outlet (2); wherein each of the outlet conduits (5) has a flow restriction in the form of a nozzle (20) or vortex diode (7). A method to control such a centrifugal separator, in order to provide a stable flow through said outlet conduits (5), combinations of values of flow rate and density of the heavy phase is established where a stable flow through said outlet conduits (5) are maintained, the flow rate and density of the heavy phase in said second hermetic outlet (2) are measured continuously or intermittently and compared to said combinations of values by said PLC 52, the flow rate in said second hermetic outlet (2) and/or said first hermetic outlet is regulated so a stable flow is maintained.
Claims (16)
1. A centrifugal separator for clarification of a liquid mixture into a heavy phase and a light phase, having a centrifugal separator bowl rotatable around an 5 axis and encasing a separation space, and a sludge space radially outward of said separation space, comprising a hermetic inlet for feeding a liquid mixture to said separation space; a first hermetic outlet for a separated ied light phase; a second hermetic outlet for a ted heavy phase; 10 a plurality of outlet ts ing from an outer position in said sludge space to said second hermetic outlet; n each of the outlet conduits has a flow restriction in the form of a nozzle or vortex diode.
2. A centrifugal separator according to claim 1, wherein said outlet conduits 15 are at least partly shaped as pipes.
3. A centrifugal separator according to one of claims 1 or 2, wherein the cross-section of said outlet conduits is circular. 20
4. A centrifugal separator according to one of claims 1-3, wherein the flow restrictions are in the form of exchangeable pieces.
5. A centrifugal separator according to claim 4, wherein the flow restrictions are formed in a ring piece having one vortex diode or nozzle for each outlet 25 conduit.
6. A centrifugal separator according to one of the preceding claims, wherein the second hermetic outlet for heavy phase has a mechanical seal of larger diameter than a ical seal on the first hermetic outlet for light phase.
7. A centrifugal separator according to claim 6, wherein the ratio n the radius of the heavy phase outlet mechanical seal, and the outer radius of the disc stack, is larger than 20%.
8. A centrifugal separator according to one of the preceding claims, wherein the centrifugal separator bowl has a third outlet for intermittent discharge at its periphery. 5
9. A centrifugal separator according to one of the preceding claims, wherein the outlet conduits continue as separated channels out to the vicinity of the outer diameter of an impeller comprising a pump wheel rotating with said centrifugal separator bowl, and wherein at least one flow restriction are positioned at the end of an outlet conduits at the vicinity of the outer diameter of the pump wheel.
10. A centrifugal separator according to one of the preceding claims, n a l valve is arranged in the second hermetic outlet.
11. A centrifugal separator according to one of the preceding claims, wherein 15 a control valve is ed in the first hermetic outlet.
12. A centrifugal separator according to claim 10 wherein at least one measuring device is arranged in the second hermetic outlet ing density and flow rate, which device is connected to a programmable logic controller 20 (PLC) and d to send data representing density and flow rate respectively, which PLC is adapted to process the data to determine if the combination of values of flow rate and density lies within a predetermined scope of values corresponding to a stable flow through said outlet conduits or not, wherein an actuator is adapted to manipulate one or both of said control valves in response 25 to a correction signal sent by said PLC if said combination of values of flow rate and density does not lie within said predetermined scope.
13. A method to control a centrifugal separator according to one of claims 1- 12, in order to provide a stable flow through said outlet ts, combinations of 30 values of flow rate and density of the heavy phase is established where a stable flow through said outlet conduits are maintained, the flow rate and density of the heavy phase in said second hermetic outlet are measured uously or ittently and ed to said combinations of values by said PLC, the flow rate in said second hermetic outlet and/or said first hermetic outlet is regulated so a stable flow is maintained.
14. A method according to claim 13, wherein the PLC is set to follow a curve 5 corresponding to combinations of flow rate and y in said second hermetic outlet, with a margin to a stability limit curve, under which ity limit curve the conduits may clog.
15. A centrifugal separator according to claim 1, substantially as herein described 10 or exemplified.
16. A method according to claim 13, substantially as herein described or exemplified. W0 58287
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19199430.0A EP3797872B1 (en) | 2019-09-25 | 2019-09-25 | Centrifugal separator and a method to control of the same |
| PCT/EP2020/075297 WO2021058287A1 (en) | 2019-09-25 | 2020-09-10 | Centrifugal separator and a method to control of the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NZ785439A NZ785439A (en) | 2024-11-29 |
| NZ785439B2 true NZ785439B2 (en) | 2025-03-04 |
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